期刊
ADVANCED MATERIALS
卷 30, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801972
关键词
nanoshell spheres; photodetectors; whispering gallery mode
类别
资金
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research [OSR-2016-CRG5-3005]
- KAUST Sensor Initiative
- KAUST Solar Center
- KAUST baseline funding
- Chinese Academy of Sciences
- National Natural Science Foundation of China [21031005]
Optical resonance formed inside a nanocavity resonator can trap light within the active region and hence enhance light absorption, effectively boosting device or material performance in applications of solar cells, photodetectors (PDs), and photocatalysts. Complementing conventional circular and spherical structures, a new type of multishelled spherical resonant strategy is presented. Due to the resonance-enhanced absorption by multiple convex shells, ZnO nanoshell PDs show improved optoelectronic performance and omnidirectional detection of light at different incidence angles and polarization. In addition, the response and recovery speeds of these devices are improved (0.8 and 0.7 ms, respectively) up to three orders of magnitude faster than in previous reports because of the existence of junction barriers between the nanoshells. The general design principles behind these hollow ZnO nanoshells pave a new way to improve the performance of sophisticated nanophotonic devices.
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